"""
"""

lst = [[1,2,3],
       [3,4,5],
       [4,5,6]]
       
rx = 0
ry = 0
for i in range(len(lst)):
    """
        1  [0,0]
        4  [1,1]
        6  [2,2]
        
        3  [0,2]
        4  [1,1]
        4  [2,0]
    """
    rx += lst[i][i]
    ry += lst[i][len(lst)-i-1]
print("rx:{} ry:{}".format(rx,ry))
    